[CH:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[C:3]([CH:11]=[O:12])[C:2]=1[CH:13]=[O:14].[C:15]1([Mg]Br)[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.O>O1CCCC1>[C:15]1([CH:13]([C:2]2[C:3]([CH:11]([OH:12])[C:1]3[CH:10]=[CH:5][CH:4]=[CH:3][CH:2]=3)=[CH:4][C:5]3[C:10](=[CH:9][CH:8]=[CH:7][CH:6]=3)[CH:1]=2)[OH:14])[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=12,3-Naphthalenedicarboxaldehyde (10.0 g) in dry tetrahydrofuran (100ml) was added to phenylmagnesium bromide [derived from bromobenzene (53 g) and magnesium (8 g)] in dry tetrahydrofuran (500 ml) over 1 hr. and the solution was refluxed for a further 3 hr. On cooling, water (500 ml) was added and the ethereal layer was decanted. The aqueous slurry was washed with ether (4 × 500 ml) and the combined ethereal extracts were dried (magnesium sulphate) and evaporated to dryness. The residue was purified by chromatography on silica gel and recrystallised from dichloromethane/petroleum ether (b.p. 40°-60°) to yield two isomers of 2,3-bis(1-phenyl-1-hydroxymethyl)naphthalene (III) (8.0 g. m.p. 145° and 3.0 g, m.p. 164°).
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